I like the higher buy limits in the used market in general, but there's a flaw.
In DTM the game is barely on year 2 and the used market is tight tight tight, practically nothing for me and I have 5 fleet types. Yet recently I was able to buy 4 planes in a day, so could hoover up an already tight market due to my size.
Suggestion - that the old limits of 3/7 days apply to non-private planes just dropped in the last, say, 7 game days. And that ALL bought planes go towards the 3 limit. So if I've just bought 3 planes off a mate I can't buy any used planes that have been on the market less than 7 days.
That way we get the QoL of the improvement, but cannot hoover a tight market.
In the current Modern Times, all major plane categories are going too quick (especially popular cargo conversion models) and offering the big airlines unlimited expansion. For the casual player replacing a few old birds or leased planes would be difficult. It's just not good for the overall health of the game.
The change needs a tweak even for gameworlds that have run longer.